Audemars Piguet shows off the world’s thinnest Selfwinding Perpetual calendar

The watch is just 6.3mm thin.
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Audemars Piguet has revealed the Royal Oak RD#2, a concept watch that is the world's thinnest selfwinding perpetual calendar. The end result of five years of r&d, the watch is just 6.3mm thick and features a patented 5133 caliber that boasts an ultra-thin central rotor that is only 2.89mm. AP has managed to fit all the mechanicals into a single layer that features a moonphase, day/night indication, a 40-hour power reserve, and a 950 platinum case and bracelet alongside the annual calendar. 

The watch is currently just a concept and no plans for production have been announced.

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